Gas Water Heater as a backup for heat pump water heater

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Hello,Can anybody help me out by advising how to control a gas water heater as a backup for a heat pump water heater. I could not find in the gas water heater window option to control its operation based on outside temperature for example.Any help will be highly appreciated?Thanks all.RegardsAhmadSent from my Galaxy

Ahmad Fraij's picture
Joined: 2020-10-13
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